Notify Blink to suppress frame requests during BeginMainFrame

third_party/WebKit/Source/core/page/PageAnimator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PageAnimator_h
 #define PageAnimator_h
 
 #include "core/CoreExport.h"
 #include "core/animation/AnimationClock.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalFrame;
 class Page;
 
 class CORE_EXPORT PageAnimator final : public GarbageCollected<PageAnimator> {
  public:
   static PageAnimator* create(Page&);
   DECLARE_TRACE();
   void scheduleVisualUpdate(LocalFrame*);
   void serviceScriptedAnimations(double monotonicAnimationStartTime);
 
   bool isServicingAnimations() const { return m_servicingAnimations; }
 
+  // TODO(alancutter): Remove the need for this by implementing frame request
+  // suppression logic at the BeginMainFrame level. This is a temporary
+  // workaround to fix a perf regression.
+  // DO NOT use this outside of crbug.com/704763.
+  void setSuppressFrameRequestsWorkaroundFor704763Only(bool);
+
   // See documents of methods with the same names in FrameView class.
   void updateAllLifecyclePhases(LocalFrame& rootFrame);
   AnimationClock& clock() { return m_animationClock; }
 
  private:
   explicit PageAnimator(Page&);
 
   Member<Page> m_page;
   bool m_servicingAnimations;
   bool m_updatingLayoutAndStyleForPainting;
+  bool m_suppressFrameRequestsWorkaroundFor704763Only = false;
   AnimationClock m_animationClock;
 };
 
 }  // namespace blink
 
 #endif  // PageAnimator_h